Sink clamp



FIG. 1 is a front right perspective view of a sink clamp showing my new design;

FIG. 2 is a front elevation view of an embodiment thereof;

FIG. 3 is a rear elevation view of an embodiment thereof;

FIG. 4 is a right side elevational view of an embodiment thereof, which is a mirror image of an omitted left side elevational view thereof;

FIG. 5 is a top plan view of an embodiment thereof; and,

FIG. 6 is a bottom plan view of an embodiment thereof.

The broken lines illustrate portions of the article that form no part of the claimed design. Portions of the sink clamp are shown broken away to indicate that they have no other length beyond what is shown. 

CLAIM I claim the ornamental design for a sink clamp, as shown and described. 